The purpose of a author-year citation style is to get rid of the reference numbers. If you already see "author and year", then you know how to find it in the bibliography without the need for the number.
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egregNov 19 '12 at 17:22

Welcome to TeX.sx! Usually, we don't put a greeting or a "thank you" in our posts. While this might seem strange at first, it is not a sign of lack of politeness, but rather part of our trying to keep everything very concise. Upvoting is the preferred way here to say "thank you" to users who helped you.
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GuidoNov 19 '12 at 17:52

If you don't show an extract from the bibliography.bib file it's impossible to answer.
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egregNov 19 '12 at 17:39

here is content of bibliography.bib file pastebin. Forgive my ignorance but as I am writing this comment I have left only 600 characters, is it OK or does it have something common with karma (reputation) etc. that newbies cannot wwrite more ?
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Wakan TankaNov 19 '12 at 19:58

@WakanTanka: Comments are that short for everyone here, but you could edit your question to contain a) your answer and b) the bibliography.bib.
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StephenNov 19 '12 at 20:15

@egreg I apologize guys my mistake. Did not realized that there must be more than 2 authors to use "et al. notation". When I edited the citation like this ` author = {Bauer, David S. and Koblentz, Michael E. and ThirdSurname, ThirdForename},` Finnaly I get "Bauer et al." @Stephen when I will edit my original post wont be there such a mess in posts ? Sorry again guys.
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Wakan TankaNov 19 '12 at 20:58